<template>
  <div class="list" ref="wrapper">
   <div>
     <div class="area">
       <div class="title border-topbottom">当前城市</div>
       <div class="button-list">
         <div class="button-wrapper">
           <div class="button">{{currentCity}}</div>
         </div>
       </div>
     </div>
     <div class="area">
       <div class="title border-topbottom">热门城市</div>
       <div class="button-list">
         <div class="button-wrapper" v-for="item of hot" :key="item.id" @click="handleCityClick(item.name)">
           <div class="button">{{item.name}}</div>
         </div>
       </div>
     </div>
     <div class="area" v-for="(item, key) of cities" :key="key" :ref="key">
       <div class="title border-topbottom">{{key}}</div>
       <div class="item-list">
         <div class="item border-bottom" v-for="innerItem of item" :key="innerItem.id"  @click="handleCityClick(innerItem.name)">{{innerItem.name}}</div>
       </div>
     </div>
   </div>
  </div>
</template>
<script>
import Bscroll from 'better-scroll'
import { mapState, mapMutations } from 'vuex'
export default {
  name: 'CityList',
  props: {
    hot: Array,
    cities: Object,
    letter: String
  },
  computed: {
    ...mapState({
      currentCity: 'city'
    })
  },
  methods: {
    handleCityClick (city) {
      // this.$store.dispatch('changeCity', city)
      // 不通过actions 而是直接通过mutations
      // this.$store.commit('changeCity', city)
      // 使用mapMutations映射函数
      this.changeCity(city)
      // 跳转到首页
      this.$router.push('/')
    },
    ...mapMutations(['changeCity'])
  },
  mounted () {
    this.scroll = new Bscroll(this.$refs.wrapper)
  },
  watch: {
    letter () {
      if (this.letter) {
        // 使用循环输出的$refs会获得一个数组
        const element = this.$refs[this.letter][0]
        this.scroll.scrollToElement(element)
      }
    }
  }
}
</script>
<style lang="stylus" scoped ref="stylesheet/stylus">
  @import "~styles/varibles.styl"
  .border-topbottom
    &:before
      border-color: #ccc
    &:after
      border-color: #ccc
  .border-bottom
    &:before
      border-color: #ccc
  .list
    position: absolute
    top: 1.58rem
    left: 0
    right: 0
    bottom: 0
    overflow: hidden
  .title
    line-height: .54rem
    background: #eee
    padding-left: .2rem
    color: #666
    font-size: .26rem
  .button-list
    padding: .1rem .6rem .1rem .1rem
    overflow: hidden
    .button-wrapper
      float: left
      width: 33.33%
      .button
        margin: .1rem
        padding: .1rem 0
        text-align: center
        border: .02rem solid #ccc
        border-rdius: .06rem
  .item-list
    .item
      line-height: .76rem
      padding-left: .2rem
</style>
